Book/Report

FZJ-2018-03069

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Untersuchung der Verdampfung von Chrom sowie Bestimmung der Bindungsenergie der Moleküle Cr$_{2}$, CrGe, CrSn, CrPb und CrGe$_{2}$

Rutharft, K. (Corresponding author)FZJ* ; Hilpert, K.FZJ* ; Weil, K. G.

1988
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/18596

Report No.: Juel-2242

Abstract: A Knudsen cell-mass spectrometer system has been deeloped allowing the determination of extremely small partial pressures in the Knudsen cell. This was demonstrated by the measurement of silver partial pressures down to 1.2 x 10$^{-8}$ Pa. The large sensitivity renders possible the determination of partial pressures over a particularly large pressure and temperature range. Reliable values for the dissociation or atomization enthalpies of the gaseous molecules Cr$_{2}$, CrGe, CrGe$_{2}$, CrSn, and CrPb were therefore, abtained for the first time by the use of the second-law method (see p. 144, Table 6.1). A third-law evaluation of these enthalpy changes carries out additionally showed indirectly for the first time the existance of thermal populated low-lying electronic states for the molecules Cr$_{2}$, CrGe, CrGe$_{2}$, and CrSn. A decrease of the electronic contribution to the third-law dissociation energies of the molecules CrM (M = Ge, Sn,Pb) was observed with the increasing ordinal number of M. The appearance potentials determined for the ions Cr$_{2}^{+}$, CrGe$^{+}$, and CrSn$^{+}$ as well as the binding energies evaluated for the molecules Cr$_{2}$, CrGe, CrSn, and CrPb are also listed in Table 6.1. More information about the content of this report is given in Section 6 "Zusammenfassung and Ausblick" (Summary and outlook) of this report.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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